@article{guimarães_moreira_morgado_2002,  title={Polymorphism of the Human Immunodeficiency Virus Type 1 in Brazil: Genetic Characterization of the nef Gene and Implications for Vaccine Design},  volume={97},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02762002000400013},  DOI={10.1590/S0074-02762002000400013},  number={4},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={Guimarães, ML and Moreira, AS and Morgado, MG},  year={2002},  month={Jun},  pages={523–526} }